What are the main functions of system

The chemical name of the Vitamin B6 is

Two Strands of DNA are held together by

Which genetic condition is characterized by an extra copy of chromosome 21?

Which vein carries oxygen-rich blood from the lungs to the heart? 

What is the name of the outermost layer of the Sun?

Which one of the following amino acids is present in foods rich in proteins?

Rhizome is an underground modification of which plant part? 

Which of the following is the main end product of carbohydrate digestion?

Which part of a plant is primarily responsible for respiration? 

Which antibiotic was discovered by Alexander Fleming in 1928